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x in (-oo:+oo)
x/(-6) < 1/2 // - 1/2
x/(-6)-(1/2) < 0
x/(-6)-1/2 < 0
-1/6*x-1/2 < 0 // + 1/2
-1/6*x < 1/2 // : -1/6
x > 1/2/(-1/6)
x > -3
x in (-3:+oo)
(-3:+oo)
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